Numerical study of supersonic ejector with high primary flow temperature

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

Mohammad Reza Hashemi ¹ , Behrooz Shahriari ^{2 *} , Parviz Hashemi ³ , Mansour Asghari ⁴

1 - Mechanical Engineering, University of Birjand, Birjand, Iran
2 - Faculty of Mechanics, Malek Ashtar University of Technology, 84145-115, Isfahan, Iran.
3 - Mechanical Engineering,Malek Ashtar University of Technology, Isfahan, Iran.
4 - Mechanical Engineering, Malek Ashtar University of Technology, Isfahan, Iran.

Received: 2024-12-10 Accepted : 2025-04-05 Published : 2025-04-13

Keywords: Ejector, Numerical solution, Oblique shock, Primary nozzle, Entrainment ratio,

Abstract :

In this research, the performance of the supersonic ejector has been investigated numerically. Primary fluid conditions included a temperature of 520 and a pressure of 2.3 bar. The secondary fluid entered the ejector due to the very high momentum of the primary fluid and the pressure reduction caused by it. To reduce the outlet temperature of the ejector, the secondary fluid was considered with the temperature and pressure of the free atmosphere, which is equal to 288 and 1.01325, respectively. The validation results of the numerical solution revealed the use of the K-e RNG turbulence model provides a satisfactory agreement between the numerical and experimental data. After passing through the oblique and expansion waves, the flow at the rear of the primary nozzle enters the mixing chamber and a strong normal shock wave is formed at the end of this area. This has led to an increase in the temperature of the ejector outlet. Also, the critical pressure value for the ejector is 0.105 MPa because increasing the outlet pressure to more than that value has caused a sharp decrease in the entrainment ratio.

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